A frameless stereotaxic integration of computerized tomographic imaging and the operating microscope

Area of Science:

• Neurosurgery
• Medical Imaging
• Surgical Navigation

Background:

• Operating microscopes are crucial for microsurgery.
• Integrating preoperative imaging like CT scans into the surgical field is challenging.
• Existing methods often require rigid stereotaxic frames, limiting flexibility.

Purpose of the Study:

• To develop a computer-based system for integrating and displaying CT image data within an operating microscope.
• To achieve accurate spatial registration and perspective display without a stereotaxic frame.
• To provide surgeons with real-time, superimposed imaging information during procedures.

Main Methods:

• Spatial registration using three CT-imaged fiducial markers on the scalp.
• Ultrasonic range-finding system with spark gaps and microphones to track microscope position.
• CT data reformatting into the microscope's focal plane or a parallel plane.
• Projection of reformatted CT data into the microscope optics via a miniature CRT and beam splitter.

Main Results:

• Successful integration and display of CT data in the operating microscope.
• Accurate spatial registration and perspective matching achieved without stereotaxic frames.
• Real-time superimposition of CT information (e.g., tumor boundaries) onto the surgical field.

Conclusions:

• The developed system enables precise, frame-free integration of CT data into surgical microscopes.
• This technology enhances surgical visualization and accuracy by overlaying critical imaging information.
• Potential to improve outcomes in complex surgical procedures requiring detailed anatomical guidance.